Hey ppl! anyone who can help me with this i will be so grateful! ive been stuck on it for 2 days(dumbarse:grumpy: ) thx! 1) A proton orbits a long chared wire, making 1.0x10^6 revolutions per second. The radius of the orbit is 1.0cm. What is the wire's linear charge density? 2) Show that the on axis electic field of a ring of charge has the expected behaviour when z<<R and when z>>R. The answer to the first questions is -2.29nC/m, but im clueless about how to go about it, i've also tried applying circular kinematics but have not been successful. The second question i am absolutly dumbfounded by. Thx again anyone who helps!